Definition for Poisonous substance:

• any substance that causes injury or illness or death of a living organism

Synonyms for Poisonous substance:

• n.

  •poison (noun)
  • poison.
  •toxin (noun)
  • contagion,
  • blight,
  • germ,
  • venom,
  • contamination,
  • toxicant,
  • infection,
  • virus,
  • cancer.

• Other synonyms:

  •n.
  • toxin,
  • toxoid,
  • Toxins,
  • Toxoids,
  • toxicants,
  • noxious substance,
  • noxious substances.